Organic gardeners like this natural microbial insecticide. Thuricide's natural bacterial action is non-toxic to birds, bees, pets or humans. When leaf-chewing worms eat the treated leaves it paralyzes their digestive system and they starve to death. May be used on garden vegetables and tomatoes right up to harvest time. Controls gypsy moths, inchworms, canker-worms, tent caterpillars, cabbage looper, tomato hornworms, etc. Active ingredient is bacillus thuringiensis.